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authorSamuel Thibault <samuel.thibault@ens-lyon.org>2017-03-04 15:01:57 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-09 17:29:14 +0100
commit425e586cf95b83b424bc949ea1c0c8bb2a2be608 (patch)
tree5bf2c8f2ac46343c6ff98fed90efa5d97d796784 /drivers/staging/speakup
parent9831013cbdbd3d06430a1db01d8c32d50c7d1c04 (diff)
speakup: add unicode variant of /dev/softsynth
This adds /dev/softsynthu, along /dev/softsynth, which emits output in UTF-8 encoding, thus allowing to support 16bit characters. Most of the code is shared, only the read function has to behave differently in latin1 and in unicode mode. Since Linux only supports 16bit characters, we can just hardcode the UTF-8 encoding. Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Reviewed-by: Chris Brannon <chris@the-brannons.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/speakup')
-rw-r--r--drivers/staging/speakup/speakup_soft.c93
1 files changed, 81 insertions, 12 deletions
diff --git a/drivers/staging/speakup/speakup_soft.c b/drivers/staging/speakup/speakup_soft.c
index 2529c4629c53..1f99ce912ab9 100644
--- a/drivers/staging/speakup/speakup_soft.c
+++ b/drivers/staging/speakup/speakup_soft.c
@@ -29,6 +29,7 @@
#define DRV_VERSION "2.6"
#define SOFTSYNTH_MINOR 26 /* might as well give it one more than /dev/synth */
+#define SOFTSYNTHU_MINOR 27 /* might as well give it one more than /dev/synth */
#define PROCSPEECH 0x0d
#define CLEAR_SYNTH 0x18
@@ -37,7 +38,7 @@ static void softsynth_release(void);
static int softsynth_is_alive(struct spk_synth *synth);
static unsigned char get_index(void);
-static struct miscdevice synth_device;
+static struct miscdevice synth_device, synthu_device;
static int init_pos;
static int misc_registered;
@@ -199,13 +200,13 @@ static int softsynth_close(struct inode *inode, struct file *fp)
return 0;
}
-static ssize_t softsynth_read(struct file *fp, char __user *buf, size_t count,
- loff_t *pos)
+static ssize_t softsynthx_read(struct file *fp, char __user *buf, size_t count,
+ loff_t *pos, int unicode)
{
int chars_sent = 0;
char __user *cp;
char *init;
- char ch;
+ u16 ch;
int empty;
unsigned long flags;
DEFINE_WAIT(wait);
@@ -213,7 +214,8 @@ static ssize_t softsynth_read(struct file *fp, char __user *buf, size_t count,
spin_lock_irqsave(&speakup_info.spinlock, flags);
while (1) {
prepare_to_wait(&speakup_event, &wait, TASK_INTERRUPTIBLE);
- synth_buffer_skip_nonlatin1();
+ if (!unicode)
+ synth_buffer_skip_nonlatin1();
if (!synth_buffer_empty() || speakup_info.flushing)
break;
spin_unlock_irqrestore(&speakup_info.spinlock, flags);
@@ -232,23 +234,57 @@ static ssize_t softsynth_read(struct file *fp, char __user *buf, size_t count,
cp = buf;
init = get_initstring();
- while (chars_sent < count) {
+
+ /* Keep 3 bytes available for a 16bit UTF-8-encoded character */
+ while (chars_sent <= count - 3) {
if (speakup_info.flushing) {
speakup_info.flushing = 0;
ch = '\x18';
- } else if (synth_buffer_empty()) {
- break;
} else if (init[init_pos]) {
ch = init[init_pos++];
} else {
+ if (!unicode)
+ synth_buffer_skip_nonlatin1();
+ if (synth_buffer_empty())
+ break;
ch = synth_buffer_getc();
}
spin_unlock_irqrestore(&speakup_info.spinlock, flags);
- if (copy_to_user(cp, &ch, 1))
- return -EFAULT;
+
+ if ((!unicode && ch < 0x100) || (unicode && ch < 0x80)) {
+ u_char c = ch;
+
+ if (copy_to_user(cp, &c, 1))
+ return -EFAULT;
+
+ chars_sent++;
+ cp++;
+ } else if (unicode && ch < 0x800) {
+ u_char s[2] = {
+ 0xc0 | (ch >> 6),
+ 0x80 | (ch & 0x3f)
+ };
+
+ if (copy_to_user(cp, s, sizeof(s)))
+ return -EFAULT;
+
+ chars_sent += sizeof(s);
+ cp += sizeof(s);
+ } else if (unicode) {
+ u_char s[3] = {
+ 0xe0 | (ch >> 12),
+ 0x80 | ((ch >> 6) & 0x3f),
+ 0x80 | (ch & 0x3f)
+ };
+
+ if (copy_to_user(cp, s, sizeof(s)))
+ return -EFAULT;
+
+ chars_sent += sizeof(s);
+ cp += sizeof(s);
+ }
+
spin_lock_irqsave(&speakup_info.spinlock, flags);
- chars_sent++;
- cp++;
}
*pos += chars_sent;
empty = synth_buffer_empty();
@@ -260,6 +296,18 @@ static ssize_t softsynth_read(struct file *fp, char __user *buf, size_t count,
return chars_sent;
}
+static ssize_t softsynth_read(struct file *fp, char __user *buf, size_t count,
+ loff_t *pos)
+{
+ return softsynthx_read(fp, buf, count, pos, 0);
+}
+
+static ssize_t softsynthu_read(struct file *fp, char __user *buf, size_t count,
+ loff_t *pos)
+{
+ return softsynthx_read(fp, buf, count, pos, 1);
+}
+
static int last_index;
static ssize_t softsynth_write(struct file *fp, const char __user *buf,
@@ -309,6 +357,15 @@ static const struct file_operations softsynth_fops = {
.release = softsynth_close,
};
+static const struct file_operations softsynthu_fops = {
+ .owner = THIS_MODULE,
+ .poll = softsynth_poll,
+ .read = softsynthu_read,
+ .write = softsynth_write,
+ .open = softsynth_open,
+ .release = softsynth_close,
+};
+
static int softsynth_probe(struct spk_synth *synth)
{
if (misc_registered != 0)
@@ -322,16 +379,28 @@ static int softsynth_probe(struct spk_synth *synth)
return -ENODEV;
}
+ memset(&synthu_device, 0, sizeof(synthu_device));
+ synthu_device.minor = SOFTSYNTHU_MINOR;
+ synthu_device.name = "softsynthu";
+ synthu_device.fops = &softsynthu_fops;
+ if (misc_register(&synthu_device)) {
+ pr_warn("Couldn't initialize miscdevice /dev/softsynth.\n");
+ return -ENODEV;
+ }
+
misc_registered = 1;
pr_info("initialized device: /dev/softsynth, node (MAJOR 10, MINOR 26)\n");
+ pr_info("initialized device: /dev/softsynthu, node (MAJOR 10, MINOR 27)\n");
return 0;
}
static void softsynth_release(void)
{
misc_deregister(&synth_device);
+ misc_deregister(&synthu_device);
misc_registered = 0;
pr_info("unregistered /dev/softsynth\n");
+ pr_info("unregistered /dev/softsynthu\n");
}
static int softsynth_is_alive(struct spk_synth *synth)